Lock.



FRITZ LIERS, OF RUMMELSBURG. NEAR BERLIN, GERMANY.

LOCK.

Specification of Letters Patent.

Patented Oct. 4, 1910.

Application filed April 5, 1910. Serial No. 553,653.

To all whom 'it may concern:

Be it known that I, Fnrrz Lmns, a citizen of the German Empire, residingat Rummelsburg, near Berlin, in the Kingdom of Prussia, German Empire,have invented certain new and useful Improvements in Locks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to improvements in locks, and more particularly tothat class of locks in which a spring actuated bolt cooperates with alock-strike the bolt-nab of which is forced backward by the spring boltwhen closing the door, whereupon the boltnab holds the bolt in itslocking position until said bolt is retracted by a key or the like. Alock-strike of this general construction has been described in myapplication for patent of even date herewith.

The object of the improvements is to provide means for locking thespring bolt in its projected position, which locking means can be throwninto inoperative position merely by means of the door knob or the likedesigned for opening the lock.

With this object in view my invention relates to the matters to bedescribed hereinafter and particularly pointed out in the ap pendedclaims reference being had to the accompanying drawing forming a part ofthis specification and to the letters of reference marked thereon.

In said drawingFigure 1, is a vertical section of the part of the doorinclosing my improved lock, Fig. 2, is a detail view of the bolt, Fig.3, shows an end view and a side view of the roller used for locking thebolt, and Fig. 4, is a detail view showing the turnbuckle.

The same letters of reference have been used in all the views toindicate corresponding parts.

Within a casing h a bolt a is located which is provided with a shortnose 6 and a long nose 6 forming a recess or notch said shorter nose 6being adapted to be engaged by an abutment e of a turn-buckle 72 adaptedto be rocked by means of a door knob or the like so as to retract thebolt a, while it is thrown forward into its inoperative position by aspring In, and the bolt a can be shot forward into its operativeposition by a spring 9.

As shownboth side faces h of the casing of the lock are formed withcurved slots 0 providing guides for a roller (Z. The latter engages in anotched portion f of the bolt a in such a way as to lock the sameagainst being forced backward into its inoperative position by anypressure exerted on the bolt. The said roller cooperates with a cam facei formed on the turn-buckle, and it is adapted to be shifted upward andrearward thereby so as to permit the bolt a to be retracted by theturn-buckle. The relative position of the nose 6 and the abutment e, andthe cam face 2' and the roller cl is such that when rocking theturn-buckle b the roller (Z is first shifted into its non-lockingposition before the abutment .2 comes into engagement with the nose 6,so that the latter is free to retract the bolt a.

If after retracting the bolt, the door knob or the like is released, thespring 9 forces the bolt a forward and at the same time the roller (Zslides downward into its locking position shown in Fig. 1, in which itlooks the bolt a in such a way that it can not be forced backward by anypressure exerted on the same.

I claim herein as my invention:

1. In a lock the combination with a casing having curved slots in bothof its side faces of a bolt, a spring normally holding said bolt inlocking position, an inner shorter and an outer longer nose at the lowerrear end of said bolt, a recess formed by said noses, a roller looselyguided in said curved slots and adapted to be held in its lower positionwithin said slots and recess by the shorter nose of the bolt, means todisengage said rollers and nose and to throw said bolt out of itslocking position, and means to return said disengaging means to theiroriginal position, substantially as described and for the purpose setforth.

2. In a lock the combination with a casing having curved slots in bothof its side faces of a bolt, a spring normally holding said bolt inlooking position, an inner shorter and an outer longer nose at the lowerrear end of said bolt a recess formed by said noses, a roller looselyguided in said curved slots and adapted to be held in its lower positionwithin said slots and recess by the shorter nose of the bolt, aturn-buckle having a cam buckle into its original position, substanfaceadapted to be operated by the looking tially as described and for thepurpose set means of the lock for disengaging said roller forth.

and nose an abutment upon said turn-buckle FRITZ LIERS. engaging theouter face of said shorter nose Witnesses: for limiting the movement ofsaid buckle HENRY HASPER,

and a spring tending to return said turn- WOLDEMAR HAUPT.

